Protractor clamp for tinting machines



Filed April 6, 1932 2 Sheets-Sheet l 2 2 m n m W m 91 a L a? a w m. a 2;. WM My a w /m 0 y z 11 Z m w) 6 Z B'edrz'CkMac/wr Patented May 2, 1933 UNITED STATES FREDERICK MAUI-IE3, OF MASPETH, NEW YORK PROTRACTOR CLAMP FOR TIN'IING- MACHINES Application filed April 6, 1932. Serial No. 603,574.

This invention relates to improvements in tinting machines such as are adapted to aid in producing a plurality of small point-s, dots or lines upon a plate used in printing engravings to constitute a portion of the surface of the subject matter and also occasionally the background, whereby the illustration is given a greatly enhanced appearance.

The distance apart of such dots or lines,

1 6: that is the number to an inch, usually 50 to 200, together with the size of the dots or the thickness of the lines, determines the density of the effect produced, as in half tones, and conventional colorization symbols are effect- 15 ed by the angularity of their disposition, relative to a horizontal base, as is well established by custom.

It frequently becomes desirable to symbolically indicate that various parts of the subjectmatter' illustrated are of difierent colors,

as in chiaroscuro, where the actual colors are inadmissible, black and white only being tolerated.

It is therefore an object of this invention to provide an attachment for a tinting machine by which rows of dots or a succession of parallel lines may be transferred from a prepared screen upon the surface of a printing plate, at any of the angles representing a distinctive color.

A further feature is in the provision of means for readily shifting from one definite angle to another, accurate setting being automatically secured up on coincidence of the visible manifestations of the desired color.

4 Figures 2, 3, and 4 are reduced scale drawf ings of the same as set to produce symbolic lines of color, respectively red, blue and yel- Figure 51 is a plan view of the instrument drawn to an enlarged scale.

Figure 6 is an end view of the same.

Figure 7 is a transverse sectional view thereof taken on the center line.

Referring in greater detail to the drawings, a block receiving plate is designated by the 5 numeral 10, the same having a raised flange 11 at its rear edge from which extend forwardly reaching lugs 12-12 provided with guide ways 13-13.

Slide blocks 1414 are adj ustably mounted in the guide ways, pressed forwardly by compression springs 15-15 and controlled by knurled micrometer adjusting screw 1616, wherebythe slide blocks may be adjusted relative to the flange 11.

Fixed in the block 14 is a pivot pin 17 encircled by a compression spring 18, while in the block 14 is threaded a micrometer screw 19, its pivot point engaging a recess 21 in a connector 22, a similar connector being mounted on the'pivot pin 17 and pressed towards the screw by the spring 18.

These connectors contain openings 23 in their opposite ends and are split to present clamp elements controlled by clamp screws 7 2% provided with knurled nuts by which the conne'ctorsmay be secured in angular ad- 'justment on the alined ends 25 of a protractor bar 26, which may preferably be of considerable length.

On the forwardly reaching central portion of the base'is a raised circular seat 27 having an arcuate rear marginal edge 28 in which are set spots of color, ab0d, respectively blue, black, yellow and red.

Fixed rigidly in the'center of the base seat is the head and shank of a tubular bolt 29 having a reduced threaded upper portion 30 provided with a nut or equivalent fastening means; also 1n the seat are perforations a bc'(Z', arranged in an arcuate row directly opposite the corresponding spots a?20cl, which are at all times visible.

A clamp bar 31 is provided with a rear reaching, arcuate head 32 having a bevelled margin 33 in which are set color s DOlBS abcd., respectively blue, b ack, red and yellow, and which may be brought into registration with the color spots on the seat.

The bar 31 is pivoted at the axis of the bead 32 on the shank of the bolt and provided with a washer 34 to be clamped by the nut on the bolt when desired adjustment has been made.

Set in the head 32, at a point directly forward of the bolt 30, is a sleeve 35 bored to receive a detent plunger 36 having a stem 36 on which is fixed a knurled head 37.

Also within the sleeve is a compression spring 38 encircling the stem and tending to press the plunger into any of the perforations abccl, when brought into registration, at which time certain of. the color spots will be alined.

The extending ends of the bar 31 are formed with downturned lugs 3940, ar ranged in opposed relation, the lugs 40 carrying screws 41 to impinge on one of the elements of a frame 42 carrying a screen 43 by means of which its lines or dots may be transferred to a printing plate 44 seated on the machine plate 10.

From the foregoing it will be seen that, due to the adjusting screws 16 and 19, a variation of line or dot thickness may be obtained, and by reason of the pivotal connections the apparatus may be turned upward, off the work when desired. 7

Obviously the screen may be positioned easily and accurately with respect to the line inclination and automatically held in any of its several positions without difficulty on part of the operator.

Although the foregoing is descriptive of the preferred embodiment of the invention, it will be apparent that minor changes may be made inits construction, without the exercise of invention or conflicting with the scope of the appended claims.

Havin thus described the invention, What is claimed as new and desired to secure by Letters Patent, is

1. In an attachment for tinting machines having a pair of opposed center pivots and a frame carrying a screen provided with a multiplicity of tinting marks arranged in parallel rows, a rigid protractor base having extending ends hingedly connected to said pivots, a circular seat onsaid base, said seat bearing on its margin spaced indicia spots of unlike color, a clamp bar having an arcuate head pivotally engaged on said seat, said head also bearing indicia spots correspondlng in color to the spots on said seat, a spring 1mpelled detent carried by said head engage} able in perforations in said seat, the perforations being positioned in definite relation to the color spots on the seat, means to clamp said head to said seat, and means on said clamp bar to removably engage said screen frame whereby the inclination of the rows of tintingmarks may be indicated in accordance of the color spots in registration.

2. In combination with a protractor for tinting machines having an adjustable bar provided with a pair of opposed pivots and a tint screen carrying frame, of a protractor base engaged by said pivots, a seat on said base provided with a plurality of variantly colored indicia, a clamp bar having a head bearing corresponding indicia, said head being pivotally mounted axially on said seat, a manually operable detent pin carried by said head to engage in perforations in said seat formed in definite relation to the indicia thereon, means for clamping the head to said seat when relatively adjusted, and means car-.

ried by said bar to engage said screen frame.

3. In combination with a protractor for tinting machines having an adjustable bar provided with a pair of opposed pivots and a tint screen carrying frame, of a protractor base engaged by said pivots, a seat on said base provided with a plurality of variantly colored indicia, a clamp bar having a head bearing corresponding indicia, said head being pivotally mounted axially on said seat, means to retain said head and seat from relative movement upon registration of any of the indicia of the same color, means to clamp said head to said seat, and means to clamp said bar to said screen frame.

4. In an attachment for a tinting machine having an adjustable bar provided with a pair of opposed pivot centers and a frame carrying a plurality of parallel rows of tinting symbols, each row containing a multiplicity of transferable printing marks, an elongated rigid base having extending ends engageable by said centers, a raised circular seat mounted centrally on the forward por tion of said base, a shouldered pivot set in said seat, a clamp bar mounted on said seat to turn on said pivot, means'to clamp said bar on said seat, a spring impelled detent carried by said bar to engage in openings in said seat, means to secure said frame to said bar, and colored indicia set respectively in said seat and bar which when the same color in each is in registration permits the operation of said detent whereby said frame is positioned to allow the marks borne by it to be transferred to a printing plate at an angle representative of the color spots in registration.

5. A protractor clamp for tinting machines comprising a rigid base having extending ends pivotally connected to elements of the machine, said base having a raised, forwardly extending central seat containing an'arcuate row of perforations, a pivot bolt fixed in signature.

FREDERICK MACHER. 

